title: Optical properties of graphene nanoribbons encapsulated in single-walled carbon nanotubes.
abstract: We report the photoluminescence (PL) from graphene nanoribbons (GNRs) encapsulated in single-walled carbon nanotubes (SWCNTs). New PL spectral features originating from GNRs have been detected in the visible spectral range. PL peaks from GNRs have resonant character, and their positions depend on the ribbon geometrical structure in accordance with the theoretical predictions. GNRs were synthesized using confined polymerization and fusion of coronene molecules. GNR@SWCNTs material demonstrates a bright photoluminescence both in infrared (IR) and visible regions. The photoluminescence excitation mapping in the near-IR spectral range has revealed the geometry-dependent shifts of the SWCNT peaks (up to 11 meV in excitation and emission) after the process of polymerization of coronene molecules inside the nanotubes. This behavior has been attributed to the strain of SWCNTs induced by insertion of the coronene molecules.
authors.affiliation: A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, 38 Vavilov Street, 119991, Moscow, Russia. al.chernov@nsc.gpi.ru
authors.forename: Alexander I
authors.initials: AI
authors.lastname: Chernov
authors.forename: Pavel V
authors.initials: PV
authors.lastname: Fedotov
authors.forename: Alexandr V
authors.initials: AV
authors.lastname: Talyzin
authors.forename: Inma
authors.initials: I
authors.lastname: Suarez Lopez
authors.forename: Ilya V
authors.initials: IV
authors.lastname: Anoshkin
authors.forename: Albert G
authors.initials: AG
authors.lastname: Nasibulin
authors.forename: Esko I
authors.initials: EI
authors.lastname: Kauppinen
authors.forename: Elena D
authors.initials: ED
authors.lastname: Obraztsova
mesh_terms: D006108:Graphite / Q000737:chemistry* / Q000528:radiation effects*; D008027:Light; D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D012542:Scattering, Radiation
chemical_list: D037742:Nanotubes, Carbon; D006108:Graphite